Supervisory system



.Tune 5, 1928. 1,672,006

A. W. STEINKE sUPERvIsoRY SYSTEM Filed June 20, 1925 ZZSheets-Sheer. -1

l sUPERvIsoRY SYSTEM Filed June 2o, 1925 2 ysheets-sheet 2 fR s v Inuenlm" Huf/vus] D11. ETE-Lke Patented June 5, 1928.

entren strates UGD'ST W. STEINKE, O'FfGHICAGO, ILLINOI S; ASSIGNOR, BH MESNEASIGNKENES'DO SUPEBVISORY SYSTEM.

Application ld Jfune 20, 192,5.. Serial No. 38,488.

This invention relates ingeneral'to super:- visory provisions in telephone systems Specifically the invention relates to an improved universal' cordy circuitwvhichl automatically adapts itself' to the type of' line vwith which it is being used, and Whicharranges its supervisory circuits so thati a flashing supervisory signal', is given in connection with va magneto line and" a steady supervisory signal is given in connection with a common battery line. n l

In a `Well known magneto line telephone system, employing line lamps to call the operators attention to acallingline, a ringuprelay is energized' bythe substation generator to close the circuits to the line lamp Supervision inthe cord'- circuit is obtained'by a similar means, that is, a ringup relay is energized by the substation generator to close the circuit.' tothe supervisory lamp signals. such ay system, atten the subscriber has once operated his generator and locked upthe ringup.- relay in the cord circuit, he has no means of resignaling the operator should she.- fail'A to notice. the iirst signal; It is therefore imperative to good) service that! this supervisory signaly be displayed as conspicuously aspossible.

In a common battery system, the subscriber resignals the operator by momentarily replacing his receiver,fwhieh. operates cord circuit relaysin the Well known manner to. display the supervisory, lamps. Shouldthe operator iailto give: attentionto the cord` circuit, the common battery subcriber may press his demands by ji'ggling the receiver hook which causes the supervisory light to be iiashed Itis quite apparent thatthe commonbattery subscriberis better ableito, obtain recall and disconnect service fromx the operator, than the magneto subscrifbery is, andl that, therefore, he does not really need'fl'ashingA supervisory signals.

It is frequently. necessary inthe interests of goodv service to indiscriminately intersperse commonbattery and'niagneto lines on the switchboarctbeiore the operator, andi it isnecessary to provide this operator With means for answering calls from andextendingcall'stoeither type Ofiline with a mini- 'munr ot' effort. Inv such. installation it is commenpractioe to have tl'iefsignaling'controlifor. magneto linesmanually operated by the" operator, g and to havev the signaling; of common batteryy lines fully.` automatic with instantaneous ring-cutoff.y when the called party: answers;-

Accordingly; an objectl of my' invention-is to provide an'. improved" universal'y cord` cil.- cuit which adapts itself' automaticallyt'o the type of` linef with r WliichitI is' being used, and which adapts itself to render I flashing; or steady'supervisory' signals, depending4 upon Whether r it' is being' used With a. magneto or With a commonbattery' line.. Further objects ofmy. invention not specifically men tionedx here will: be app'arent from' the" dtaileddescription and claims which follow.

The `drawingscomprising Figs. l and 2, when placed with Fig: Qt'o the top ofiF'ig. 1 With corresponding llnes4 in alignment, .show suiiicient equipment to enable a full? under'- standingjofmyinvention; n

In` Fig: l" is shown a; universal cord" cir;- cuit' designed accordance with th'ev objects of my' invention.V This cord circuit comprises tlie lusual listening; key 15,. ring back leyl RB,l repeatinfrj coil' I, and cord.' circuit supervisoryl signa s AS andi CS, with the associated generators,vl ringing interrupters,

and supervisory pilots.

Figure Q, shows four subscriber stations A"1 tofA'f, inclusive, terminating at?y the jacks ofai manual switchboard; With the associated line f and cutorel'ays individualt'o .each line. It should be noted that the subscriber stations, Al undp/X3 areY magneto stations employingi'a. hand generators' to signal' the operator',x and having a; local batteryV transmitterl feed'l circuiti They subscribers lines A2 and Attire-*equipped for commonfbatt'ery service.: l

In orderto simplifyC the drawingslhave shown a. pluralityv oi" batteries,` Whereas in an exchangeinstallation. there would'be one battery.` preferably with the positive pole grounded,l

Havingdescribedrmy invention in general, Iy willnovv proceed'with a.-detaileddescrip tion of itsf` operation'.y Assuming, that. the subscriber at. station A1 desires to call the station A5,'.he Will'operate his'hand generator to energize his line relay-LIF, over a circuit, traceable from theflower terminal' of;y the liandl generator,Y over the. line conductor T?, through the uppery cutoff' relayfsprings to the Winding off the linerelay LR, through the jack AJ1 closes a circuit which is traceable from ground, through the two windings of lthe cutol relay CO1 in series, through the sleeve terminal of the jack AJ 1 and the plug API, over the sleeve conductor S, and through the winding of the marginal relay 102 to grounded battery. The cutoli' relay CO1 energizes over this circuit, breaks the previously traced circuit for the line relay LRl, and restores the armature of relay LR1 to normal by vmeans ot a mechanical interlocking device, thereby extinguishing the line lamp LIL In vthe cord circuit, relay 102, being marginal, will not energize in series with the cutoll relay, when the two windings of the latter are connected serially.

' The operator now thro Ws her listening key L lto close the contacts 162, 164 and 167, and the. subscriber removes the receiver from the switchh'ook, thereby adapting the equipment to receive the conversational orders. The voice currents from the substation Al 'travel over the line conductor R1, through the jack and plug over the plug, conductor R, through the key contacts 161 and its break contact,`through the winding 111 or' the repeating coil I, through the condenser C, through winding 110 of they repeating coil, through key contacts 160, the tip conductor T, through the plug and jack, through the tip line conductor T1, thence through the telephone in the wel] known manner. Currents induced in the windings 112 and 113 of the *cutol relay CO3 energizes over this circuit and disconnects the line relay LR3, thereby preparing'the called line 'lor the subsequent application of ringing current. Relay 105, being marginal will not energize in series with the cutol relay, when the two windings thereof are connected serially. The operator 'then reoperates her listening key L to open the springs162, 164 and 167 and to close the springs 165 and 166 thereby projectin ringing current from the generator through the spring 166 and its make contact, the ring conductor R and ring of the plug CP and the jack (Us, over the ring line conductor R3, through the bells of thecalled station A", to the tip conductor T, throuffh the tip of the jack CJS and the'A plug C tip conductor T, through the spring 165 and its make contact to ground. The called party answers his signal now and conversation takes place in the well known manner. When the subscribers have completed their conversation they replace their receivers and operate their generators to notify the operator that their connection can be taken down. Operation of the hand generator at substation A1 projects current out over the talking conductor T to the winding 110 of the repeating coil I, thence through the break contact of spring 121, through the winding of relay 101, to the winding 111 of .the repeating coil, ring conductor R, and thence over the previously traced circuit backto the generator. The relay 101 is energized in this circuit and locked in an energized` position by means of the well known ring-up lock with which it is equipped. Operation of relay 101 closes a circuit from ground, through the answering supervisory lamp AS, springs 126, through the winding of relay 116 to battery. The relay 116 is operated over this circuit, while the signal AS does not light in series with relay 116. The latter, upon operating, closes the spring 135, establishing an obvious circuit to relay 115 and flashing pilot FP. Relay ll'energizes, at spring 130 supplies direct battery to the signal AS and shunts out the 'relay 116, which deenergizes after an interval and opens the circuit of relay 115. The signal AS being connected to direct battery while relay 115 is energized, will light. Relay 115 vdeenergizes after an interval to again permit 116 to energize. This interaction of relays 115 and 1.16 causes the flashing pilot FP and the answering supervisory lamp AS to flicker in the well known manner.

` Operation of the hand generator at station A3 projects signaling current over the line,

conductor Tl to the winding 112 of the repeating coil I and then through the break contact of spring 131, through the winding of relay 106, through the winding 113 of the repeating coil, and thence over the previously traced circuit back to the generator.

Relay 106 energizes over this circuity and locks up by means of the well known mechanical lookup device previously referredto. peration of relay 106 closes a circuit from ground, the calling supervisory lamp CS,' y springs 140, through springs 136, and thence through the relay 116 over the path identical with that already traced. The calling supervisory lamp CS is flashed in the manner mem-ccc similar to that :described ifor ztlimanswering supervisory Plamp AS. operator upon observing the @flashing is'- al :operates 'her .listening key to close .springs v162, 164 and 167, closing a circuit trom ground, spring 167 land its rnakeA contact, thence' ,throng two lparallel paths, v4the vone through resistance I1.19 through .spring 132 and -.its..break conta-ct, through the lower winding-reif relay l10/1 to battery, and .theiother .through resistance 109, spring 122 and itsihreak contact, through the `lower winding of ,relay 103; .to battery. Relays 103v and 104i energiae over? lthe circuits and, by means of the @mechanical interlocking device, by fmeans voft which `they are connected to relays 5101 and :106, Vrespectively, unlock the latter .relays ,and ,restore theni to normal. This .operation opens lthe circuit of answering supervisory lamp AS.- at vspring 126, and .of the calling supervisory lampv CS. atspring 130, Vexiting.uishing ithcm. The operator, when operatingher listening lkey L, connects her `headset to the .cord-;ci1

cuit and, before. taking :dow-n the connection,

inquires for further instruction from the subscribers. fIjf no further instruction` -is received she removes theV .plugs AP;a1id CIP and restores the key L to normal, restoring all energized relays andputting the equipment in readiness, for another call.

vWhen a subscriber atY A1 desires tocall' a subscriber at A, the operation is :identical up to the lpoint where the operator inserts the `calling plug LCP into the .calling jack.

' Having received the instructions :to connect to the line A4k ythe operator yinserts .the plug CP into the calling jack .CJ, closing a circuit from ground, through the two windings of 'thecutoif relay in parallel,

through the sleeve connection .of ithe jack CJ4 and the plug ,CPwthrough ,the sleeve conductor S', through .the Windingof relay 105 =to grounded battery. Relays C()4 :and 105 'both energize over the circuit, relay 5105 being marginally adjusted to energize in series with the two windings of the cutoff klrelavs when `they are connected yin parallel.

Relay CO, upon energizing, ydisconnects vthe line -relay LR@- from the line conductors C* and R4, thereby preparing that line for .the application .of ringing current. In thecord circuit relay 105 upon energizing at springs 13.1 and 132 Vprepares the battery feed cir- .cuit .for station A4 by connecting the lrelay 104 across the condenser C. .Atspring '133, -relay 105 prepares the circuit for the ringing `control relay 108, and at spring 134 `closes the circuit from` ground fthrough .calling lsu- ,pervisory lamp CS, springs'140, springsl 1124,

vsprings 134 .to battery, lighting fthe calling supervisory lamp CS. Theoperator vnoting .that the calling supervisory lamp CS is operated knows that she is callingacommon Sbattery `line and there-tore operates the ringing key-RK, causing va circuitygfremground .through Ysprings 168, through the :winding of relay 1108,- through .springs 118 and ,13,3 `to battery, .energizing the lrelay 108. ,'Relcy 108 upon energizing locks yitself through springs 13.9', 137,. 127, vspring 120 V,und lits break .contact to fgroundg at ,springs 13.81 and springs 150 prepares the circuit vfor the -ap- .plication -ofringing current Eto the, called fline; and at spring lrtbreaks :thespreviousl-y described .circuit to tthe calling supervisory CS, to extinguish that lanip. Ringing current isinow projected out on vthe called line over a circuitqtra'ceable `from `grounded batter-y to. the :ringing generator `Gc 4through spring 151 and its :break cmitact, `through Ithe winding .of relay ,107 `and the resistance 107vr in parallel, :through spring .1,238 ,audits make contact, spring 165 isndfitsfbreakicntact, Aover the tip .conductor T., vthe tip of the plug CP, the jack Clcline z,conductor T4, .through the -hooksiiritch7 bells and colidenser of the called substation A?, ,to ming Aconductor; Rf, through the ming of jackCJ and plug CP, -`over-the ring conductor R', through the spring 166 and `its breek 400ntact, ythrough spring 150and lits ,make- Qontact to ground. The :ringing interruptor R1 revolves, and in course ,ottime closes. :the obvious circuit vfor fthearelay i117, .which .en-

ergizes and Vhrealrs ,the ,above clinging cur-f freut ,at springs 115,1, supplying direct. ibattery to the ringing cimu'it` The bellsreat station A# are thereby intcrmittcntly.y rung until the called party answers. When the called v party removes Vthe vreceiver y'from Athe switch-1 hook, a direct current bridgeis orrnedfacross the line by substituting therccciver ,and the transmitter tor the fbellsv andithe condenser. lf this occurs during a ringing z cried, kili- .rect current is Vprojected "from -the battery through the generator, andthenceover :the :previously 'traced circuit to ground; at `spring 150 and il? .this occursidurng .a silentpeniod, ,battery isr projected. from spring :15:1 midis make Contact, thence over 'the `@previouslyY :traced circuit tokground atspring 150..

.either case relay 107 :,energizcs .in this direct current circuit, at spring 137 brnaks the .previouslydescribed ,locking circuit. `of :ringing :control .relay ,108, allowing that. frela-y' te restore. Relay. 108 at spring :138 and its ibreak Contact, and spring 1150 and .its break contact, completes ya circuit. yfrom :the substation over `the 'previously' .described circuit, `to spring 13:8. `rand its break contact,r

vthrough winding 112- of the repeating coil I, through spring 131 .and its .make contact, through the upper winding of relay 1104,10 ground, and through the .other vbranch ,to

spring 150 and its `break contact, through" Vthe winding f 1130i the repeating coil :1, through the spring 132..and itsfmake contact, :through the :lower win-ding of relay H104 fto grounded battery.; Relay 104 ener- L DI] .giace nner-:this circuit-.1in sen-ies. .with the 13 transmitterl and receiver of the station A,

and at spring 124 interrupts a point in the circuit of calling supervisory lamp CS to prevent that lamp from lighting as long as the receiver at station A4 remains oif the hook. At spring 178 relay 104 interrupts the circuit of ringing control relay 108 to prevent the reenergizing of that relay should thevkey 163 be accidentally depressed. The parties A1 and A4 may now converse, the former receiving battery supply to the transmitter coming from the local battery over the previously described circuit, and the latter receiving its transmitter battery supply through the windings of relay 104.

When the conversation is completed station Al rings off as before to display the flashing supervisory lamp AS. .Station A'1 replaces his receiver breaking the circuit to relay 104, which falls back and at spring 124 closes the circuit to calling supervisory lamp CS, y'causing that supervisory lamp to be lighted. The operator, noting the signals, supervises the call andremoves the plugs as described previously.

In case the subscriber at station A2 desires to make. a call, he removes his receiver from the switchhook, closing the circuit to .he line relay LRL, which energizes and lights the line lamp LLL. The operator, noting the lamp, inserts' the plug AP into the jack AJ2, closing a circuit from ground through the two windings of the relay C()2 in parallel, to the sleeve of jack AJ2 and plug AP, through the Winding of relay 102 to battery. Relays CO2 and 102 energize over this circuit, the former opening the circuit of line relay LR2 which falls back and extinguishes the line lamp LL2. In the cord circuit, relay 102, upon energizing, at springs 121`| and 122 connects the relay 103 across the line circuit in series lwith the windings 110 and 111 of the repeating coil I. Relay 103 energizes, at spring 125 opens the circuit of the answering supervisory lamp AS, and at spring 124 prepares a point in the locking circuit of the ringing control relay 108. The operator operates her listening 'key to ascertain the number of the wanted party, which f may be either A3 or A4. r1 hel calling operation is identical withthe previous description. In the event that the wanted party is station A4, the operator rings this station by locking up the relay 108 over a circuit traceable by way of springs 139,- 137, 124, and 120, and its make contact, to ground. It the wanted party answers, the circuit is interrupted at spring 137 when the relayr 107 energizes. If, however, the called party does `not answer' promptly and the calling party replaces his. receiver abandoning the call, the locking circuit of relay 108 is broken at spring 124 when the relay 103 deenergizes. Relay 108 falls back and completes the circuit of calling supervisorylamp CS lightingthis signal steadily, and the'circuitto .-supervisorylamp AS is closed by Way of spring 125, spring 123, the winding of relay 114 to battery. yRelay 114 energizes to close `the circuit to the supervisory pilot lamp SP.

.Supervisory lamp AS over the springs 126,

to the supervisory pilot FSP, causing the supervisory lamp AF-to be flashed as `before described. The relay 101, at spring 127, interrupts the locking circuit of relay 108, causing that relay to deenergize and to disconnect the ringing current from the called line. The operator supervises the call and takes down the connection as explained. f f

From the foregoing description it vwill be evident that I have designed new and use-l ful supervision features for magneto lines. Vlnle I have chosen to illustrate my invention in lconnection with a particular type of equipment, I have done so merely by way ot example, as there are many modifications previously i which can be made by one skilled in the art,

without departing from the` scope ot' the invention.

What I consider new and desire to' have 'protected by Letters Patent is pointed out in the appended claims.

vWhat is claimed is:

. 1. In a telephone system, a magneto subscribers line, a common battery subscribers line, a cord circuitcontaining an answering supervisory signal and a calling supervisory signal, means for initiating a call from said magneto line, means for connecting said cord circuit to said calling line and for extending the connection to said common battery line as a called line, means for automatically projecting ringing current on said called line, and means controlled' by said calling subscriber for disconnecting saidringing current.

2. In a telephone system, a magneto subscribers line, a common battery subscribers line, a cord circuit containing an answering supervisory signal and a calling supervisory signal, means for initiating a call from said magneto line, means for connecting said cord circuit to said calling line and for extending the connection to said common battery line as a called line, means for automatically projecting Aringing current on said called line,

and means controlled by said calling sub scrber for disconecting said ringing current and for flashing said answering supervisory signal.

3. In a magneto telephone system, sub,

' sive to the operation of said line relays by said magneto lines for intermittently operating said supervisory signals.

4. In a magneto telephone system, subscribers lines, magnetoson said lines, cord circuits including supervisory signals and line relays, said line relays being normally connected in bridge of the talking conductors of said cord circuits and adapted to be operated by said magneto lines, means for connecting said cord circuits to said lines, `mechanical means for locking said line relays in their operated positions, a. pair of relays operated responsive to the operation of said line relays by said magneto lines for intermittently operating said supervisory signals,

and means to release said line relays from their operated positions to stop the operation of said signals.

5. In a telephone system, subscribers lines of two types, apuniversal cord circuit containing signals, means for connecting said cord circuit with said lines, asingle relay means for ladapting the cord circuit to the type of line With which it is being used, and double relay means for intermittently operating said signals when the cord is being used with one of said types of lines'.

6./ In a telephone system, subscribers lines of two types, a'universal cord circuit containing a plurality of signals and a line relay, means for connecting said cord circuit with said lines, a single Yrelay means for adapting said cord vcircuit to the type of line with which it is bein used, means to energize said line relay W en said cord is being used with one of the types of said lines, mechanical means to lock vsaid line relay energized, and a double relay means operating responsive to the energization of said line relay for intermittently operating said signals simultaneously.

In Witness whereof, I hereunto subscribe my name this 16th day of June, A. D. 1925.

AUGUST W. STEINE. 

